ANOMIA. 337 



neated, is, however, of a pure white except upon tlie um- 

 bones, which are of a clear bluish green. The sculpture is 

 very peculiar, the surface never exhibiting any of the 

 characteristic ribs of the previous species. In place of 

 them, it is covered with an infinity of most minute radiat- 

 ing series of small depressed or imbricated (yet somewhat 

 vaulted) scales, which are disposed in such extremely close 

 order as to leave no visible interstitial lines : the more 

 abraded, or less fully developed examples, appear simply 

 impressed with most crowded radiating striec. These scales 

 and striae regularly emanate from the umbo, and are not 

 moulded, as it were, by the adhesion of the valves to any 

 similarly sculptured body. 



Both Mr. M 'Andrew and Mr. Jeffreys have taten this 

 scarce Northern shell in the Hebrides : the latter gentleman 

 at Loch Carron and Ullapool. Mr. Barlee has taken it at 

 Oban. It inhabits the Scandinavian seas. 



Note. — In the Cornish Fauna of Jonathan Couch, we find an An. inflata (pt. 2, 

 p. 39,) which is assuredly the fry of one of our larger species, and probably of 

 ephippium. We have not seen the types, which are in the Museum of the 

 Royal Institution of Cornwall ; but give the description verbatim. 



" This which I suppose to be undescribed is a minute species, the diameter of 

 the disk being about the tenth of an inch. The form is circular, the valves 

 smooth and regular ; but it is especially characterized by the elevation of its 

 centre, which is almost as high as the diameter of the valve. From this the beak 

 is bent down, and small. The specimen described, which was attached to the 

 shell of a Pinna, has the summit inflated and round ; but a specimen which I 

 found in Mount's Bay attached to sea-weed, was about equally elevated, but 

 pointed. Further research will decide whether these specimens belong to the 

 same species. In another specimen, found with the former in Mount's Bay, the 

 beak approached but did not join the margin ; and the upper valve was character- 

 ized by a number of well-marked circular raised ribs," 



X X 



